DE1758139A1 - Process for the step-by-step transport of hot material through an oven and oven for carrying out the process - Google Patents

Description

Eb θ en, den. 5th April 1968 N 4281 / W Yo./Sch.

Koppers-Wietra-Ofenbau limited liability company, 4 Düsseldorf-Heerdt. Wleaenstrasae 134

Method for the step-by-step transport of heat material through a furnace and furnace for carrying out the method

The invention relates to a method for step-by-step transport of heat from the input side to the output side of an oven, in which can also reach high and extremely high temperatures, and an oven for performing the method.

At the moment pusher ovens, walking beam ovens, tunnel ovens are mainly used as well as roller hearth furnaces intended for this purpose. Each of these known types of ovens has its advantages, but also its specific disadvantages, which limit the possible uses.

The pusher furnaces are suitable for heating steel for the rolling process, are robust and can now be provided with slide rail attachments that report undercooled zones in the material to be heated. Her However, the length is limited depending on the dimensions of the slab or billet. It is not possible to use the oven further to run empty normal operating resources.

The walking beam ovens are now also available with heating of the material to be heated executed from below. The walking beams then consist of wasaerge

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cooled pipes, which are also water-cooled Stutsen, the so-called uprights, are attached. The walking beam furnace can be built in any length. It prepares from the transport no difficulties in transporting any material cross-section through the furnace at the same time, and the furnace can in empty in both directions. On the other hand, there are the following disadvantages: The support system for the material to be heated, i.e. the cooled support tubes and posts, must be available twice, since the Warmth rests alternately on the fixed and the movable system. As a result, the cooling water heat losses are very high. at When the material to be heated is transferred from one system to the other, the load-bearing systems are heavily stressed by the impact that occurs in the process and must therefore be carried out particularly vigorously. Any ceramic insulation of the water-cooled pipes is carried out stresses the shock in such a way that it tends to drop prematurely in continuous operation. If you want supercooled strips at the support points of the material to be heated on the support system, you have to use an attachment stttoke Provide on the pipes that take on the temperature of the material to be heated and consist of high-heat resistant metal alloys. This from The temperature already highly stressed parts are also heavily stressed by the impacts and must also be available in double number, so that such a furnace becomes very expensive. Large masses have to be accelerated and decelerated again within a short time, so that even when used a so-called Oewiohtsausgleichssysteme considerable forces and Energies must be expended.

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In the tunnel kilns, in which carriages with a continuous hearth occupying the width of the oven are transported through the oven, the carriage must be heated at the same time, which either leads to a high energy consumption or requires additional devices for the recuperation of the heat contained in the carriage . In addition, the space required for returning the trolleys from the output to the input side of the furnace is considerable. Furthermore, if the heat material M is also to be fired from below, so-called setting aids must be used to a large extent, which make operation more expensive and make it more difficult to operate.

You use of roller hearth furnaces is limited by the fact that they

can only be used up to a certain temperature range can. Also, the stove rolls are flawless in terms of quality

Heated goods surface problematic because their surface is calibrated

form slag deposits in the course of operation (pimple formation),

which are shown on the surface of the heated goods. '

The invention now relates to a method sum step-by-step transport of the material to be heated and the associated furnace, with the rake parts of the aforementioned types can be avoided and a simple structure and economical operation can be achieved. Bas transportation method is daduroh marked that the WHragut sun does not grow on then reciprocable part of the calibration extending in the conveying direction two-part bar rests, the two-part bar then around

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their longitudinal axis can be pivoted or rotated and the good thereby on the part of the which can be moved back and forth in the conveying direction Rolls the bar, the material is moved on this bar part in the conveying direction, the two-part bar again around its longitudinal axis swiveled back or turned back and the Out thereby opens again the non-movable part of the beam is rolled, the movable beam part then unloaded back into its starting position is retracted. This doorway is repeated at certain time intervals.

Figure 1 illustrates the process.

It shows a device according to the invention in a simplified, schematic structure la cross section. The heat 1 lies on the in this example circular, two-part bars 2,3, which in turn can roll on the support 4. Zn the upper Representation, the heat product rests on the non-movable back and forth Part 2. After turning the bar counterclockwise, the item to be heated rests on part 3, which can be moved back and forth in the lower illustration. This can now move in the conveying direction whereupon the bars are turned back clockwise again so that it is again the one shown in the figure above Location results. The movable part 3 is then withdrawn again from its starting position, whereupon the process is repeated.

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A furnace for carrying out this method has two-part beams which extend in the conveying direction and which are arranged around their longitudinal axis are pivotable or rotatable. One extends over the entire length of the bar extending part can be moved back and forth in the conveying direction, while the other part, which also extends over the entire length of the furnace extends, is not movable, but only rotatable. This type of construction is particularly suitable for Ufen, where the heating also takes place from below, i.e. where there is a heated room below the rotating beam. The movable and the non-movable part of the rotating beam can move over their entire length Support one another via sliding or roller bearings, as is also the case with the schematic diagram in Figure 1. The beam parts can consist of liquid-cooled hollow bodies and for the support of the goods not cooled, divided, preferably wear metallic heat support. The latter can encompass a web on all sides that forms part of the liquid-cooled Is hollow body or is blurred with the latter. The support parts for the heat and the two bars can be further Formation of the invention lie next to one another with a small continuous distance, so that there is a gap between them for tinder to fall through. Finally, the load-bearing Material cross-section of the non-movable beam part essentially lie below the support for the heat and the movable part can be guided by rollers on a bar that only at individual points duroh connecting webs with the non-movable Part is connected.

009883/0835

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The pivoting or rotation of the rotating beam can be done by mounting around a fixed axis of rotation. The heat goods supports can be designed as a circular cylinder at the top, and the axis of rotation of the rotating bar can coincide with the center of the circular cylinder. According to the invention, the rotating bar can also be mounted on 2 rollers which are mounted within a liquid-cooled cross bar and protrude upward through cutouts from the cross bar. The pivoting or rotation can also be done by rolling the rotating beam on the supports, as shown in Figure 1.

Figure 2 shows a rotating beam, its non-movable part 5 and reciprocating part 6 as a liquid element Hollow bodies are executed. The movable part is supported over its entire length over 6 each in a common cage 7.

led Rollevtuif a bar 9, which only in individual places connected to the non-displaceable part by "connection webs 10" is. 11 denotes the heat product supports placed on the two halves of the bar, which encompass the webs 12 on all sides, which are connected to the liquid-cooled hollow bodies are welded. The sheet 13 serves to repel the scale that falls through the gap between the two beam parts, which are closely spaced next to each other lie. Hit 14 is the insulation of the two beam parts.

Figure 3 shows the same design in a simplified representation and greater reduction, the cross-section this time through

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The support of the rotating beam is placed. The liquid-cooled crossbeam 15 carries the rotating beam over two rollers 16, which are firmly mounted in crossbeams and are also cooled by the liquid. The r.ichtverfahrlmre part of the turntable. <■ · .; 17 at this point a circular cylinder section 1u for the support, the center point 13 of which is at the same time the center of the heat product supports 20 (rider) * designed as a circular cylinder above. HJt 21 is the insulation of the different parts * ⁵ .

Figure 4 shows the rotating beam with its support on the transverse beam in a top view.

The embodiment according to the invention shows the following advantages:

Compared to the pusher oven you have the option of emptying a dee Oven cheap. The material dimensions also play a role for transport no role »i.e. any thin material thickness can be transported behind thick slabs. Opposite the walking beam furnace ait'Unterbeheisung, it is advantageous that in the case of the Construction does not require two independent support systems for the heat material. The great cooling one The surface of the double support system in the walking beam furnace increases its heat consumption considerably and, above all, hinders the Thermal radiation on the material to be heated from the lower heating room.

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The more numerous the cooler tubes are in the lower oven, the stronger the deoto let the so-called shadow formation on the Wämigut. In addition, the numerous tubes hinder the heat balance in the lower furnace and in the case of fuel heating, the unhindered flood fire Flame and the even distribution of the smoke gases.

With the rotating beam furnace according to the invention, the beam parts can be calibrated "support each other and therefore hardly need more than a single beam for others to achieve the necessary strength Ofeney et one. The beam halves of the rotating beam furnace are so close together together so that no insulation is required between them and therefore the shading area is twice as large Insulation strength is reduced. The two halves of the beam are üurcj. the 6 rows of rollers led in a common Kttfiss against each other over the entire length safely and with little rolling resistance against each other, so that a possible tendency of one Beam part for discarding can not lead to difficulties. The scale is discharged through the gap between the beam parts, the narrowest point of which is at the top. Because the fulcrum » around which the rotating bar rotates, which is also the center of the circular arc-shaped rider delimitation, the heat remains during the entire movement process at the same geodetic height. It does not therefore need to be lifted and set down with each movement, as is the case with the walking beam furnace, which is important for the large volume of heating goods transported in Valzverksöfen Forces and energies are required. Advantageously 1st welter »dafl

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the transfer of the material to be heated from the movable to the non-movable » The bar part of the rotating beam furnace is completely smooth, which cannot be achieved with the walking beam furnace. Hence are also none of the carrying drive elements are exposed to any shocks »what for whose dimensioning and lifespan is important. this is particularly important for insulation, which tends to fall off when exposed to impact.

The design according to the invention is characterized by this compared to the tunnel furnace in the gate part that when the material to be heated is transported through the furnace, the large mass of the conveying aids, i.e. the bogie, does not need to be heated, which results in a favorable energy consumption and additional facilities for the recuperation of the Heat contained in the car can be dispensed with.

Compared to the roller hearth furnace is special on the small and therefore to point out a favorable ratio between the surface area to which the material is placed and the surface area of the support elements. While hell on hers the entire surface must be set up to accommodate the material to be heated, but only a small fraction of it actually carries the heat material, the wanagut lies with the rotating beam during the whole time only in a small area of its scope, so that only this small area made of the expensive, highly heat-resistant, metallic material needs to exist for the heat support. The majority of the rotating beam surface, on the other hand, is surrounded by ceramic insulation, the lowest possible heat loss with low material costs.

" ¹⁰ " WHEEL

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In a further embodiment of the invention it is proposed that the non-movable part is firmly connected to it via webs, Hollow body open at the top is deceptive, in which the movable part is supported. The hollow body, which is open at the top, is also used for cooling a pleasure. filled. In order to avoid warping of the insulation even under the stronger effects of heat if the insulation has fallen To avoid the outer wall of the movable hollow body, which is open at the top, P can, however, make this outer wall relatively thin-walled be reinforced with ribs that extend inwardly into the coolant.

Figure 5 shows such an embodiment, with the non-movable beam part 22 with the help of the bolts 23 supports the liquid-cooled body 24 open at the top, ie the outer wall 25 through the Bippen 26 is stiffened. The heat support 27 dee movable Rope · is supported on the continuous beam 28, which is his

. Forces over the rollers with horizontal axis 29 on the questioning bar

t '·' ■ ■ ■ ' ■ ■ ■

30 and over the rollers with vertical axis 31 on the housing de » Hollow body transfers. 32 denotes a space for deposition, for example penetrating impurities.

The support pieces of the beam parts can also be designed θ «in, that they lie against each other without play. In this case, see Of course, a continuous gap to remove the scale · Figure 6 shows an example of a design with support tube 33 and

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Non- moveable warm goods support 34. The moveable warm goods support 35 is guided with the help of the gay-friendly guide 36 in such a way that a gap between the two warm goods supports is avoided.

009883/0835

Claims (5)

Eeβen, April 5, 1968 H 4281 / W To./Sch. Claims 1.) Procedure for the step-by-step transport of heat material through a Oven, characterized in that the material (t) initially rests on the non-reciprocating part (2) of the two-part beam extending in the conveying direction, which The two-part bars are then pivoted or rotated about their longitudinal axis and the Out rolls onto the part (3) of the bars that can be moved back and forth in the conveying direction The two-part bar is swiveled back again about its longitudinal axis and since Out is thereby rolled back onto the non-movable part of the beam, the movable beam part is then returned to its original position without any load. 2.) Oven for carrying out the method according to claim 1, characterized marked, that two-part, There are bars which extend in the conveying direction and are pivotable or rotatable about their longitudinal axis, the one, extending over the entire length of the beam, can be moved back and forth in the direction of conveyance, the other, even * if the part that extends over the entire length of the beam cannot be moved. - 13 - 009883/0835 ORIGINAL BATHROOM '. YES N 4281 / W 5.4.1968 - 13 - 3.) Oven according to claim 2, characterized in that there is a heated space below the rotating beam. 4.) 'Oven according to the preceding claims, characterized in that the non-movable and the vorfahi'bare part of the rotating beam are supported on one another over the entire length via sliding or roller bearings. 5.) Furnace according to the preceding claims, characterized in that that the beam parts are made of liquid-cooled hollow bodies exist and not refrigerated, subdivided, wear metallic heat support. 6.) Oven according to claim 5, characterized in that the heat support encompasses a web on all sides, which is part of the liquid-cooled hollow body or is welded to the latter is. 7.) Furnace according to the preceding claims, characterized in that that the heat supports and the two beam parts with a small, continuous distance next to each other, creating a space for the scale to fall through. ^ 8.) Oven according to claim 7 »characterized in that the load-bearing co Material cross section of the non-movable beam part in ω is substantially below the heat support and. the comparable ° mobile part is guided by rollers on a ledge, the tn at individual points by connecting "a tege with the comparable nioht feasible part is connected . _llÄ1 BATH ORIGINAL - 14 - N 4281 / W 5.4.1966 - 14 - 9.) Oven according to the preceding claims, characterized in that the pivoting of the rotating beam by a bearing takes place around a fixed pivot. 10.) Oven according to claim 9 #, characterized in that the warm goods supports are designed as a circular cylinder and the top Axis of rotation of the rotating beam with the center of the circular cylinder fc collapses 11.) Oven according to the preceding claims, characterized in that the bearing of the rotating beam takes place on rollers, the are stored within a liquid-cooled crossbar and step out of the crossbar upwards through the recesses. 12.) Oven according to the preceding claims, characterized in that the pivoting or rotation takes place by rolling the rotating beam on the supports. \ 13 ·) Oven according to the preceding claims, characterized in that the non-movable part has a bit over webs carries firmly connected hollow body open at the top, in which the movable part is supported, wherein the hollow body open at the top is filled with a liquid for cooling. 14.) Oven according to claim 13, characterized in that the outer wall of the movable part is reinforced by ribs, the extend inwards into the coolant _K 009883/0835 - 15 - ORIGINAL BATHROOM 21 4281 / W 5.4.1968 - 15 - 1'-),) Of ^ n according to the preceding claims, characterized thereby- Tif- ¹ , approx .; The / uflagestilckc the corner parts 1 lie against each other without 3 play. 009883/0835 BAD ORIGlNAU Blank page